Replacement parts for picture below

It's tough to say. I can only see the base of your operator in this photo. A large portion of the assembly is still obscured from view, so at this stage I'm afraid I don't know what you have. I can't really judge if one of our parts will work for you.

Your next step should be to remove the operator from the window in its entirety and show me a clear photo of it. Seeing the whole thing in one shot would be ideal, arm and all. Please let me know if that would be possible.